Safety device for gas-line leakage



y 1939. cs. MAYNARD SAFETY DEVICE FOR GAS-LINE LEAKAGE Filed Feb. 26', 1958 ugq hard,

Patented- May 30, 1939 I 2,160,748

UNITED STATES PATENT OFFICE 2,160,748 I SAFETY DEVICE FOR GAS-LINE LEAKAGE Guy Maynard, Lexington, Mass.

Application February 26, 1938, Serial No. 192,856 9 Claims. (01. 48-193) Gas lines leading into buildings frequently walls 3 and 4 of the vent casing are provided break or crack, due to settling ground, freezing with slots 5 and 6 flaring to the bottom of the and thawing, etc., and the leaking gas tends to casing which is open. The slot 5 is somewhat follow the pipe-line into the building for the deeper than the slot 6 and at its closed end is 5 reason that a space forms along the pipe-line provided with a lug l seating on top of the pipe-. 5 as a result of expansion and contraction of the line to provide clearance spaces '8 through which pipe-line, thereby subjecting the buildings and leakage gas following the top of the pipe-line their occupants to the hazards of explosions, can pass into the vent casing 3. The upper end asphyxiation, etc. of the vent casing is provided with a threaded Objects of the present invention are to proboss 9 to receive a vent pipe Ill extending a suit-i" 10 vide a device for preventing the leaking gas from able distance above the ground and carrying on flowing into the building and for venting it to its upper end a hood II and a screen l2. The the atmosphere outside the building, and to provent casing is also provided with slots l3 to revide the device in a form which is simple and ceive bolts it for attaching the vent casing to economical to construct, which may be installed the seal casing after the two casings have been 15 quickly and easily on a pipe-line already installed separately applied to the pipe-line. and which is durable and effective in use. The seal casing shown in Figs. 1, 2, 4, 8 and 9 In one aspect the invention involves a seal is open on the end next tothe foundation of casing and a vent casing which may be septhe building and the other end is provided with arately applied to a pipe-line and then attached a slot l5 extending downwardly from the open. 20

together, after which the seal casing may be top of the casing. This end wall is also profilled with sealing material. vided with opening It to receive the bolts M.

In other aspects the invention involves a slot- Extending through aligned openings in the side ted casing which may be fitted over a pipe-line walls of the seal casing are bolts l! for supafter the pipe-line is installed, flaring slots or porting the casing on the pipe-line. To apply: 25 other means to accommodate pipes of different this seal casing to a pipe-line after the pipe-line sizes, detachable means for suspending the seal has been installed the casing is fitted over the casing on the pipe-line while the casing is being pipe-line upside down as shown in full lines in filled with sealing material, and other features Fig. 8 and then rotated 180 as indicated by the hereinafter disclosed and claimed, arrow and broken lines to the position shown 30 For the purpose of illustration typical emin Fig. 9. The bolts l! are preferably applied bodiments of the invention are shown in the while the casing is still in inverted position so accompanying drawing in which that the casing is supported on the pipe-line Fig. 1 is a vertical sectional view of an inby the bolts during and after rotation. stallation; In making the installation the procedure is 35 Fig. 2 is an end view, viewed from the house preferably as follows: The seal casing is first side, with parts in section; applied to the pipe-line as above described, the Fig. 3 is an end view of the vent casing viewed Vent casing is then fitted downwardly over the from the end away from the house; pipe-line to the position shown in Fig. 1, and Fig. 4 is a section on line 4-4 of Fig. 2; the bolts M are then applied to secure the two 40 Fig. 5 is an end view of a modified seal casing casings together. With the open end of the viewed from the end away from the house; seal casing held tightly against the foundation Fig. 6 is a section on line 66 of Fig. 5; 2 the casing is filled with pitch, asphalt or other Fig. '7 is a perspective view of inserts for use suitable sealing material as indicated at IS in in the embodiment shown in Figs. 5 and 6; Fig. 1, all cracks at each end of the seal casing 45 Fig. 8 is an end view showing the method of being filled with packing material before the applying the seal casing to the pipe-line; and sealing compound is poured. At any convenient Fig. 9 is an end view of the seal casing aptime after the sealing compound has set, earth plied to the pipe-line, viewed from the end away may be filled around and over the casings to from the house. the desired level. 50

The particular embodiment of the invention From the foregoing it will be evident that the chosen for the purpose of illustration comprises flaring slots 5 and 6 in the vent casing will aca vent casing V and a seal casing S for applicommodate pipes of different diameters and that cation to a pipe-line I just outside of the founthe slot in the seal casing may flare upwardly for dation 2 of a building. The outer and inner the same purpose, the slots [3 permitting the 55 two casings to be secured together at different relative elevations. Instead of using flaring slots the slots may be made large enough to accommodate the largest size pipe used for gas lines, as indicated at IS in Figs. 5 and 6, with a flange 20 forming a U-shaped recess 2| to receive inserts of different sizes such as shown at 22 and 23 in Fig. '7.

According to the present invention leakage gas tending to follow the upper side of the pipe-line into the building is effectively blocked by the seal casing and its contents and is permitted to escape to the atmosphere through the vent cas- I ing and the vent pipe It).

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.

I claim:

1. A safety device for preventing leaking gas from following a pipe-line into a building comprising a hollow vent casing and a hollow seal casing each having aligned openings to permit the casings to be fitted over a pipe, the vent casing having an opening in its upper portion to permit the escape of gas, and means for interlocking the two casings against angular movement relative to each other about the pipe-line.

2. A safety device for preventing leaking gas from following a pipe-line into a building comprising hollow separate interconnected seal and vent casings having slots to permit the casings to be fitted over a pipe-line which has been installed, the vent casing having an opening in its upper portion to permit the escape of gas, and. means for interlocking the two casings against angular movement relative to each other about the pipe-line.

3. A safety device for preventing leaking gas fromiollowing a pipe-line into a-building comprising hollow separate interconnected seal and vent casings having slots extending to the top and bottom of the casings respectively to permit the casings to be fitted over a pipe-line which has been installed, the vent casing having an opening in its upper portion to permit the escape of gas.

4. A safety device for preventing leaking gas from following a pipe-line into a building comprising hollow separate interconnected seal and vent casings open at the top and bottom respectively and having slots extending to their open sides to permit the casings to be fittedover a pipeline which has been installed, the vent casing having an opening in its upper portion to permit the escape of gas.

5. A safety device for preventing leaking gas from following a pipe-line into a building comprising hollow separate interconnected seal and vent casings open at the top and bottom respectively and having slots extending to their open sides to permit the casings to be fitted over a. pipe-line which has been installed, the vent casing having an opening in its upper portion to permit the escape of gas and certain of said slots flaring toward their open ends to fit pipes of different sizes.

6. A safety device for preventing leaking gas from following a pipe-line into a building comprising a seal casing having an opening in a side wall to permit the pipe-line to pass therethrough and an opening in the top through which the casing may be filled with sealing material after it is applied to the pipe-line, and means on the side of said casing remote from the building to permit the escape of gas upwardly from the pipe line.

7. A safety device for preventing leaking gas from following a pipe-line into a building comprising a seal casing having a bottom and side walls, one side wall having a slot extending from the top part way toward the bottom to receive the pipe-line, the opposite side of the casing having an opening to be closed by the foundation of the building so that the casing may be filled with molten sealing material, and. means on said first side of the casing to vent gas upwardly from the pipe-line.

8. A safety device for preventing leaking gas from following a pipe-line into a building comprising a seal casing having a slot extending downwardly thereinto from the top to receive a pipe-line, and detachable means for suspending the casing on the pipe-line while it is being poured with sealing material.

9. A safety device for preventing leaking gas from following a pipe-line into a building comprising a hollow vent casing and a hollow seal casing each having aligned openings to permit the casings to be fitted over a pipe, the vent casing having an opening in its upper portion to permit the escape of gas, one of said casings having a vertical slot, and means extending through said slot for interlocking the two casings against angular movement relative to each other about the pipe-line.

GUY MAYNARD. 

